[Issue 8310] New: writeln of Range of fixed size array

June 27, 2012
Posted by bearophile_hugs@eml.cc
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bearophile_hugs@eml.cc
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http://d.puremagic.com/issues/show_bug.cgi?id=8310

           Summary: writeln of Range of fixed size array
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2012-06-27 05:21:17 PDT ---
import std.stdio: writeln;
import std.algorithm: map;
import std.array: array;
void main() {
    char[2] two = ['a', 'b'];
    auto pieces = [1, 2].map!(x => two)();
    writeln(pieces.array());
}


It gives an acceptable output (dmd 2.060alpha):

["ab", "ab"]



But printing the lazy range itself fails:


import std.stdio: writeln;
import std.algorithm: map;
void main() {
    char[2] two = ['a', 'b'];
    auto pieces = [1, 2].map!(x => two)();
    writeln(pieces);
}


...\dmd2\src\phobos\std\format.d(1978): Error: template std.format.formatValue
does not match any function template declaration
...\dmd2\src\phobos\std\format.d(1203): Error: template std.format.formatValue
cannot deduce template function from argument types
!()(LockingTextWriter,char[2u],FormatSpec!(char))
...\dmd2\src\phobos\std\format.d(2006): Error: template std.format.formatValue
does not match any function template declaration
...\dmd2\src\phobos\std\format.d(1203): Error: template std.format.formatValue
cannot deduce template function from argument types
!()(LockingTextWriter,char[2u],FormatSpec!(char))
...\dmd2\src\phobos\std\format.d(2474): Error: template instance
std.format.formatRange!(LockingTextWriter,Result,char) error instantiating
...\dmd2\src\phobos\std\format.d(2761):        instantiated from here:
formatValue!(LockingTextWriter,Result,char)
...\dmd2\src\phobos\std\format.d(420):        instantiated from here:
formatGeneric!(LockingTextWriter,Result,char)
...\dmd2\src\phobos\std\stdio.d(683):        instantiated from here:
formattedWrite!(LockingTextWriter,char,Result)
...\dmd2\src\phobos\std\stdio.d(1594):        instantiated from here:
write!(Result,char)
test.d(6):        instantiated from here: writeln!(Result)
...\dmd2\src\phobos\std\format.d(2761): Error: template instance
std.format.formatValue!(LockingTextWriter,Result,char) error instantiating
...\dmd2\src\phobos\std\format.d(420):        instantiated from here:
formatGeneric!(LockingTextWriter,Result,char)
...\dmd2\src\phobos\std\stdio.d(683):        instantiated from here:
formattedWrite!(LockingTextWriter,char,Result)
...\dmd2\src\phobos\std\stdio.d(1594):        instantiated from here:
write!(Result,char)
test.d(6):        instantiated from here: writeln!(Result)
...\dmd2\src\phobos\std\format.d(420): Error: template instance
std.format.formatGeneric!(LockingTextWriter,Result,char) error instantiating
...\dmd2\src\phobos\std\stdio.d(683):        instantiated from here:
formattedWrite!(LockingTextWriter,char,Result)
...\dmd2\src\phobos\std\stdio.d(1594):        instantiated from here:
write!(Result,char)
test.d(6):        instantiated from here: writeln!(Result)
...\dmd2\src\phobos\std\stdio.d(683): Error: template instance
std.format.formattedWrite!(LockingTextWriter,char,Result) error instantiating
...\dmd2\src\phobos\std\stdio.d(1594):        instantiated from here:
write!(Result,char)
test.d(6):        instantiated from here: writeln!(Result)
...\dmd2\src\phobos\std\stdio.d(1594): Error: template instance
std.stdio.File.write!(Result,char) error instantiating
test.d(6):        instantiated from here: writeln!(Result)
test.d(6): Error: template instance std.stdio.writeln!(Result) error
instantiating

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